This is useful when the index needs to be treated as a column, or
when the index is meaningless and needs to be reset to the default
before another operation.

Parameters

levelint, str, tuple, or list, default optional

For a Series with a MultiIndex, only remove the specified levels
from the index. Removes all levels by default.

dropbool, default False

Just reset the index, without inserting it as a column in
the new DataFrame.

nameobject, optional

The name to use for the column containing the original Series
values. Uses self.name by default. This argument is ignored
when drop is True.

inplacebool, default False

Modify the Series in place (do not create a new object).

Returns

Series or DataFrame

When drop is False (the default), a DataFrame is returned.
The newly created columns will come first in the DataFrame,
followed by the original Series values.
When drop is True, a Series is returned.
In either case, if inplace=True, no value is returned.